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Infodoc ID   Synopsis   Date
21434   How to boot system into 64 bit mode or 32 bit mode.   21 Apr 2000

Description Top

In some instances it is necessary to boot the system to 32 bit mode
or 64 bit mode.

To find out if your machine can boot into 64 bit mode, enter

	# isalist

If you do not see "sparcv9", you will not be able to boot this
system into 64 bit mode.

Note: On Ultra systems with a CPU speed of 200 MHz or less, the file
/platform/sun4u/boot.conf must have the following line uncommented:

ALLOW_64BIT_KERNEL_ON_UltraSPARC_1_CPU=true

If this line was commented out when the system was booted, isalist will NOT
list sparcv9 as an option, even if all packages for 64 bit support are
installed.

===================================================================

To see if you are currently in 64 or 32 bit mode, enter:

	# isainfo -v

If the output shows:

	64-bit sparcv9 applications
	32-bit sparc applications

then you are running 64 bit mode.  

If the output shows:

	32-bit sparc applications

then you are booted into 32 bit mode.

===================================================================

To change modes, enter the following at the "ok>" prompt:

	To set up booting 32-bit mode:
		setenv boot-file kernel/unix

	To set up booting 64-bit mode:
		setenv boot-file kernel/sparcv9/unix



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